Lehrstuhl für Technische Thermodynamik

The WALS-demonstrator can be used to determine particle characteristics during the production of nanoparticles. To that end, different laser-optical measurement techniques are combined. Laser-induced incandescence (LII) allows the determination of primary particle size and volume concentration, while wide-angle light scattering (WALS) can be used to measure the size and shape of particle clusters. With the help of an ellipsoidal mirror, high-resolution scattering data can be obtained, from which particle size distributions can be determined. The user receives the results on aerosol characteristics in quasi real-time.

One research focus is the characterization of fuel sprays using optical measurement techniques. Microscopic spray parameters (droplet diameter and droplet velocity) are as well a part of the measurement spectrum as the spray analysis as a whole. This serves to determine penetration depths, cone angles and other macroscopic spray parameters. Since fuel injections are fast processes, lasting only a few milliseconds, high-speed measurement techniques with up to 100,000 images per second are increasingly used for the investigation.